m396 #00-011 Posted October 4, 2003 Report Share Posted October 4, 2003 I like your thinking, as I have wondered about this too. My vibration under thottle was there before lowering, and of course is still there. I've heard to many stories of shims not working and wondered about the balance of the shaft in general. Thanks for confirming my suspisions! Link to comment Share on other sites More sharing options...
SSminneapolis Posted October 4, 2003 Report Share Posted October 4, 2003 congrats on the solution...sorry but only good vibrations here... Link to comment Share on other sites More sharing options...
98 SS ON NOS Posted October 9, 2003 Report Share Posted October 9, 2003 there is tons of gap still there. what do you guys measure to the fenderlips TO GROUND 33 in front and 34 in rear when its lowered. and is that a 1/1 drop. looks good though Link to comment Share on other sites More sharing options...
SSminneapolis Posted October 9, 2003 Report Share Posted October 9, 2003 nice garage... Link to comment Share on other sites More sharing options...
rico750sxi Posted October 9, 2003 Report Share Posted October 9, 2003 Well I installed the 2* shims in mine and it didn't help the vibration. After posting my problem on FSC.com a couple guys said I should reverse the shims. So I'm going to try and reverse the shims and see what happens. Now though I may get a couple hose clamps and try that out. My thing is I didn't have this before so I figured the shims were the way to go. Not sure what I'll do now. I really don't want to have to remove the driveshaft. I may bite the bullet and buy the GroundForce kit. Hey dfs, how did you know where to put the clamps, just trial and error? Link to comment Share on other sites More sharing options...
dfs41 Posted October 9, 2003 Report Share Posted October 9, 2003 rico I went through the whole process of installing the shims - small ones - big ones - also reversed them as well. The vibration remained. Historically, I have found that the vibrations are generally caused by the front and rear u-joints being 'out of phase'. When a vehicle is lowered, the pinion angle at the diff is changed - potentially changing the angle of the joints enogh to place them out of phase. The shims were used to bring the angle back to 'stock'. I can't see how any 'kit' will change much. The ones I have seen all use the same concept - shackles in the rear, and keys in the front. I'm not sure what the keys will do for you, that unwinding the bars won't. With the SS, you can only go so low without messing up the angles of your front half shafts. You can get to that point by just turning the bars. The clamp weights were put on as a test to see if it would make a difference - to help narrow down the source of the vibration. As a pure guess, the clamps were installed a tthe rear of the drive shaft, with the worm screws placed in line with a weight that was already welded to the shaft. I got very lucky that spot showed an improvement. If the vibration is more severe, change the rotational placement of the clamps. It may take a bit of time to find the right spot, but it will let you know if it is the shaft, and might save you some cash for the kit. Good luck. Don Link to comment Share on other sites More sharing options...
rico750sxi Posted October 9, 2003 Report Share Posted October 9, 2003 I'm pretty sure my vibration isn't being caused by the front. When I had only the front lowered I took it for a ride and I didn't notice anything. This only developed when I lowered the rear. This is what leads me to believe it's my pinion angle. I've only had this since installing the shackles. Link to comment Share on other sites More sharing options...
98 SS ON NOS Posted October 11, 2003 Report Share Posted October 11, 2003 like the s10s you will need to push the carrier cross member up 1 inch. i made a custom billet spacer and that took vibration away id look into that Link to comment Share on other sites More sharing options...
rico750sxi Posted October 11, 2003 Report Share Posted October 11, 2003 Do you mean for a 2 piece driveshaft because the SS is a one piece. Link to comment Share on other sites More sharing options...
98 SS ON NOS Posted October 11, 2003 Report Share Posted October 11, 2003 well have you seen the pinion angle to the tranny. is the angle of the driveshaft straight from the tranny to the rear end? Link to comment Share on other sites More sharing options...
Nightshift Posted October 12, 2003 Report Share Posted October 12, 2003 I feel the urge... WW Link to comment Share on other sites More sharing options...
Lee Posted October 12, 2003 Report Share Posted October 12, 2003 Link to comment Share on other sites More sharing options...
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